.Net: Updates to WebFileDownloadPlugin

[markwallace-microsoft]

Motivation and Context

1. AllowedDomains - Provide control over which domains can be downloaded from
2. AllowedFolders - Provide control over which folders can be written to
3. DisableFileOverwrite - Disable overwriting existing files
4. MaximumDownloadSize - Set a maximum size of a download that will be written

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[markwallace-microsoft]

Following integration tests failed:

[xUnit.net 01:00:11.42]     MongoDBIntegrationTests.Collections.MongoDBCollectionConformanceTests.CreateCollectionCreatesTheCollection [FAIL]
[xUnit.net 01:00:11.42]       System.TimeoutException : The operation has timed out.
[xUnit.net 01:00:11.42]       Stack Trace:
[xUnit.net 01:00:11.42]         /_/src/Testcontainers/Configurations/WaitStrategies/WaitStrategy.cs(209,0): at DotNet.Testcontainers.Configurations.WaitStrategy.WaitUntilAsync(Func`1 wait, TimeSpan interval, TimeSpan timeout, Int32 retries, CancellationToken ct)
[xUnit.net 01:00:11.43]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.And_within_And [FAIL]
[xUnit.net 01:00:11.43]     MongoDBIntegrationTests.HybridSearch.MongoDBKeywordVectorizedHybridSearchTests.SearchShouldReturnExpectedResultsAsync [FAIL]
[xUnit.net 01:00:11.43]     MongoDBIntegrationTests.HybridSearch.MongoDBKeywordVectorizedHybridSearchTests.SearchWithFilterShouldReturnExpectedResultsAsync [FAIL]
[xUnit.net 01:00:11.42]         /_/src/Testcontainers/Containers/DockerContainer.cs(560,0): at DotNet.Testcontainers.Containers.DockerContainer.CheckReadinessAsync(IEnumerable`1 waitStrategies, CancellationToken ct)
[xUnit.net 01:00:11.43]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Not_over_Or [FAIL]
[xUnit.net 01:00:11.44]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.NotEqual_with_string [FAIL]
[xUnit.net 01:00:11.44]     MongoDBIntegrationTests.HybridSearch.MongoDBKeywordVectorizedHybridSearchTests.SearchWithTopShouldReturnExpectedResultsAsync [FAIL]

[xUnit.net 01:00:11.45]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.GreaterThanOrEqual_with_int [FAIL]
[xUnit.net 01:00:11.45]     MongoDBIntegrationTests.HybridSearch.MongoDBKeywordVectorizedHybridSearchTests.SearchWithSkipShouldReturnExpectedResultsAsync [FAIL]
[xUnit.net 01:00:11.45]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.And [FAIL]
[xUnit.net 01:00:11.45]     MongoDBIntegrationTests.HybridSearch.MongoDBKeywordVectorizedHybridSearchTests.SearchWithMultiTextRecordSearchesRequestedFieldAsync [FAIL]
[xUnit.net 01:00:11.45]     MongoDBIntegrationTests.Collections.MongoDBCollectionConformanceTests.CreateCollectionCalledMoreThanOnceThrowsVectorStoreOperationException [FAIL]
[xUnit.net 01:00:11.45]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Legacy_AnyTagEqualTo_array [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.HybridSearch.MongoDBKeywordVectorizedHybridSearchTests.SearchWithMultipleKeywordsShouldRankMatchedKeywordsHigherAsync [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Equal_with_string_is_not_Contains [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Contains_over_inline_string_array [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Collections.MongoDBCollectionConformanceTests.CreateCollectionIfNotExistsCalledMoreThanOnceDoesNotThrow [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Equal_with_null_captured [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Legacy_AnyTagEqualTo_List [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Collections.MongoDBCollectionConformanceTests.CreateCollectionCalledMoreThanOnceThrowsVectorStoreOperationException_GenericDataModel [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Contains_over_captured_string_array [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.LessThanOrEqual_with_int [FAIL]
[xUnit.net 01:00:11.46]     MongoDBIntegrationTests.Filter.MongoDBBasicFilterTests.Equal_with_string_containing_special_characters [FAIL]